build: only check --engine-strict for production deps (googleapis#406)

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Source-Link: googleapis/synthtool@5451633

.github/workflows/ci.yaml

@@ -16,7 +16,11 @@ jobs:
         with:
           node-version: ${{ matrix.node }}
       - run: node --version
-      - run: npm install --engine-strict
+      # The first installation step ensures that all of our production
+      # dependencies work on the given Node.js version, this helps us find
+      # dependencies that don't match our engines field:
+      - run: npm install --production --engine-strict
+      - run: npm install
       - run: npm test
       - name: coverage
         uses: codecov/codecov-action@v1

synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/nodejs-asset.git",
-        "sha": "d2b27fc846b873e02ba4121ff8a1ed0156c2d679"
+        "sha": "18d6522d9b0b8362700ce1171417fb23e2c704bc"
       }
     },
     {
@@ -19,7 +19,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "0c868d49b8e05bc1f299bc773df9eb4ef9ed96e9"
+        "sha": "5451633881133e5573cc271a18e73b18caca8b1b"
       }
     }
   ],